<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewpoint" content="width=device-width",initial-scale=1.0>
        <title>Document</title>
        <style>
            *{
                margin: 0px;
                padding: 0px;
            }
            html,body{
                width: 100%;
                height: 100%;
            }
            body{
                background-color: pink;
                display: flex;
                flex-direction: row;
                justify-content: center;
                align-items: center;
            }
            .heart{
                width: 200px;
                height: 200px;
                background-color: red;
                position: relative;
                transform: rotate(45deg);
                animation: heartbit 1s alternate infinite;
                box-shadow: 0 0 30px red;
            }
            .heart::before{
                content: "";
                width: 200px;
                height: 100px;
                background-color: red;
                position: absolute;
                left: 0px;
                top:-99px;
                border-radius: 100px 100px 0px 0px;
                box-shadow: 0 0 30px red;
            }
            .heart::after{
                content: "";
                width: 100px;
                height: 200px;
                background-color: red;
                position:absolute;
                left: -99px;
                top:0px;
                border-radius: 100px 0px 0px 100px;
                box-shadow: 0 0 30px red;

            }
            @keyframes heartbit{
                0%{
                    transform: rotate(45deg) scale(0.6);
                }
                /*25%{
                    transform: rotate(45deg) scale(0.8);
                }
                50%{
                    transform: rotate(45deg) scale(1);
                }
                75%{
                    transform: rotate(45deg) scale(1.2);
                }*/
                100%{
                    transform: rotate(45deg) scale(1.4);
                }
            }
        </style>
    </head>
    <body>
        <div class="heart"></div>

    </body>
</html>